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Strongly enhanced temperature dependence of the chemical potential in FeSe

DOI: 10.1103/PhysRevB.95.195111 DOI Help

Authors: L. C. Rhodes (Royal Holloway, University of London; Diamond Light Source) , Matthew Watson (Diamond Light Source) , A. A. Haghighirad (University of Oxford) , M. Eschrig (Royal Holloway, University of London) , T. K. Kim (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 95

State: Published (Approved)
Published: May 2017
Diamond Proposal Number(s): 12799 , 14454

Open Access Open Access

Abstract: Employing a 10-orbital tight-binding model, we present a set of hopping parameters fitted directly to our latest high-resolution angle-resolved photoemission spectroscopy (ARPES) data for the high-temperature tetragonal phase of FeSe. Using these parameters, we predict a large 10 meV shift of the chemical potential as a function of temperature. To confirm this large temperature dependence, we performed ARPES experiments on FeSe and observed a ∼25 meV rigid shift to the chemical potential between 100 and 300 K. This strong shift has important implications for theoretical models of superconductivity and of nematic order in FeSe materials.

Subject Areas: Materials, Physics

Instruments: I05-ARPES